Further Delineation of the ALG9-CDG Phenotype

JIMD Rep. 2016:27:107-12. doi: 10.1007/8904_2015_504. Epub 2015 Oct 10.

Abstract

ALG9-CDG is one of the less frequently reported types of CDG. Here, we summarize the features of six patients with ALG9-CDG reported in the literature and report the features of four additional patients. The patients presented with drug-resistant infantile epilepsy, hypotonia, dysmorphic features, failure to thrive, global developmental disability, and skeletal dysplasia. One patient presented with nonimmune hydrops fetalis. A brain MRI revealed global atrophy with delayed myelination. Exome sequencing identified a novel homozygous mutation c.1075G>A, p.E359K of the ALG9 gene. The results of our analysis of these patients expand the knowledge of ALG9-CDG phenotype.

Keywords: ALG9-CDG; Congenital disorders of glycosylation; Epilepsy; Hydrops fetalis; Skeletal dysplasia; Whole exome sequencing.